A heater of 400 Watt was on for 5 hours what is electrical Consumption
Correct answer: C. 2 KWh
- A. 20 KWh
- B. 12 KWh
- C. 2 KWh
- D. None of the above
Explanation
To determine the electrical consumption, first convert the power from Watts to kilowatts: 400 Watts is equal to 0.4 kW. Then multiply the power by the time the heater was on: 0.4 kW x 5 hours = 2 kWh. Therefore, the correct answer is 2 KWh.Option A (20 KWh) is incorrect because it assumes an erroneous power usage of 4000 Watts, which is not given. Option B (12 KWh) is incorrect due to an incorrect power conversion to 2.4 kW. Option D ('None of the above') is incorrect because a valid solution exists with the provided information, which is 2 kWh.
Last updated
About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
Practise Current Electricity
1,052 free Current Electricity MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
0.75 A current flows through an iron wire when a battery of 1.5 volts is connected across its ends. The length of the wire 5.0 m and its cross-sectional area is 2.5 x 10^-7 m2. What is the resistivity of iron?
1.6 mA current is flowing in conducting wire then the number of electrons flowing per second
1 kilo ohm = _ ohm
1 microvolt is
1/Req = 1/Rl + 1/R2 + 1/R3 + ..... +1/Rn is the combination in